> Entering a deep C state can cause strange things to timers: some of > them, especially tsc, become unreliable. The Nehalem family CPU has a non-stop constant-frequency TSC. The measurements that Yanmin quotes show that the TSC is the lowest overhead timesource in the system. thanks, Len Brown, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html